Need advise

I am finalising my shopping list for a new system which I will be using for FSX and many other things including development. I appreciate if I do not get replies like "FSX still not run on any system", I read enough and frankly I am not interested on such comments, I heard that before and in anycase I will buy FSX whatever the settings I need to make. I am thinking of the following:-Motherboard: ASUS P5WDG2-WS I hope this allows for future upgradability.Processor: Core Duo 6600Video Card: 7600GS 512Mbyte Is it OK for FSX.RAM: 2 Gbyte would like some idea regarding type which is cost effective. I have seen prices vary from one type to another and I do not know exactly the benefit of spending too much on memory type.PSU: I was thinking buying a 600 Watts but again I appreciate advise.I am not thinking of overclocking but I may do so I appreciate any guidlines on what I should be careful about.Thanks